The compressed air requirements of a textile factory are met by a large compressor that draws in 0.6 m3/s air at atmospheric conditions of 20°C and 1 bar (100 kPa) and consumes 300 kW electric power when operating. Air is compressed to a gage pressure of 8 bar (absolute pressure of 900 kPa), and compressed air is transported to the production area through a 30-cm-internal-diameter, 83- m-long, galvanized steel pipe with a surface roughness of 0.15 mm. The average temperature of compressed air in the pipe is 60°C. The compressed air line has 8 elbows with a loss coefficient of 0.6 each. If the compressor efficiency is 88 percent, determine the power wasted in the transportation line. The roughness of a galvanized steel pipe is given to be ɛ = 0.00015 m. The dynamic viscosity of air at 60°C is µ= 2.008 × 10-5 kg/m-s, and it is independent of pressure. The density of air listed in that table is for 1 atm. The density at 20°C, 100 kPa and 60°C, 900 kPa can be determined from the ideal gas relation to be 100 kPa = 1.189 kg/m³ %3D Pin = RTim (0.287 kPa-m/kg-K)(20+273 K) p = Pline = Pine 900 kPa = 9.417 kg/m³ %3D RTine (0.287 kPa-m/kg-K)(60+273 K) The power wasted in the transportation line is kW.

The compressed air requirements of a textile factory are met by a large compressor that draws in 0.6 m3/s air at atmospheric conditions of 20°C and 1 bar (100 kPa) and consumes 300 kW electric power when operating. Air is compressed to a gage pressure of 8 bar (absolute pressure of 900 kPa), and compressed air is transported to the production area through a 30-cm-internal-diameter, 83- m-long, galvanized steel pipe with a surface roughness of 0.15 mm. The average temperature of compressed air in the pipe is 60°C. The compressed air line has 8 elbows with a loss coefficient of 0.6 each. If the compressor efficiency is 88 percent, determine the power wasted in the transportation line. The roughness of a galvanized steel pipe is given to be ɛ = 0.00015 m. The dynamic viscosity of air at 60°C is µ= 2.008 × 10-5 kg/m-s, and it is independent of pressure. The density of air listed in that table is for 1 atm. The density at 20°C, 100 kPa and 60°C, 900 kPa can be determined from the ideal gas relation to be 100 kPa = 1.189 kg/m³ %3D Pin = RTim (0.287 kPa-m/kg-K)(20+273 K) p = Pline = Pine 900 kPa = 9.417 kg/m³ %3D RTine (0.287 kPa-m/kg-K)(60+273 K) The power wasted in the transportation line is kW.

Sustainable Energy

2nd Edition

ISBN:9781337551663

Author:DUNLAP, Richard A.

Publisher:DUNLAP, Richard A.

Chapter14: Ocean Thermal Energy Conversion And Ocean Salinity Gradient Energy

Section: Chapter Questions

Problem 9P

See similar textbooks

Similar questions

A pump is attached to a fire hydrant, where it is desired to produce a jet that rises to a maximum height of 40 m and delivers water at a rate of 100 L/s. At the attachment location, the diameter is 100 mm and the pressure is estimated as 150 kPa. The discharge nozzle has a diameter of 80 mm and is inclined at an angle of 50 degrees to the horizontal. If friction losses are neglected, estimate the head that must be added by the pump to achieve the desired objective. The path of the water jet is parabolic.
A liquid of specific gravity of 1.75 flows in a 6 cm horizontal pipe. The total energy at certain point in the flow is 80 J/N (joules/newton). The elevation of the pipe above the fixed datum is 2.6 m. If the pressure is 75 kPa. Determine the velocity of flow in m/s. A.23.86 b.32.45 c.37.85 d.42.25l
How much energy can be stored in a tank of water -- 1 m3 -- for a compression corresponding to 1+ S % volume change. Bulk Module of water is 2178 MPa. (S=4 )
Steam enters a long, horizontal pipe with an inlet diameter of D1=12 cm with a velocity of 2 m/s. And out let D2=10 cm, Determine (a) the mass flow rate of the steam and (b) the rate of heat transfer Take; h1 = 3051.6 kJ/kg; h2 = 2950.4kJ/kg, v=0.25799 m3 /kg
Water in pressurized cylindrical tank 40 ft. in diameter discharges into the atmospherethrough a nozzle 4 inches in diameter. Neglecting friction, and assuming unsteady flow;find the time required for the water in the tank to drop from a level of 50 ft. above thenozzle to 2 ft. above it if the tank is under constant gauge pressure of 1 atm. State anyassumptions.
4. An igloo or Eskimo hut is built in the form of a hemispherical shell with an inside diameter of 12 ft. If the igloo is constructed of snow blocks having a uniform thickness of 2ft and weighing 40 lb per cu. ft, find the weight of the igloo, neglecting entrance. Also, if fresh air contains 0.04 per cent carbon dioxide, find the amount this gas in the igloo when freshly ventilated.
Water is pumped up from a reservoir to a smaller holding tank. If the flow rate through the pipe is 50 LPM, find the NPSH available immediately before the pump. The length of the pipe from the reservoir to the pump is 13.1 meters, and its diameter is 2.8 cm. The distance is h2=6.8 m. Assume a friction factor of 0.021. The vapor pressure of water at the current temperature is 2,399 Pa. Current atmospheric pressure is 95,194 Pa. The density of water is 991 kg/m^3
A centrifugal pump delivers water at the rate of 50 kg/s. The inlet and outlet pressures are 2 bar and 6.2 bar respectively. The suction is 2.2m below the centre of the pump and delivery is 8.5m above the centre of the pump. The suction and delivery pipe diameters are 200mm and 100mm respectively. Determine the capacity of the electric motor considering the efficiency of motor as 80% to run the pump.
An igloo or Eskimo hut is built in the form of a hemispherical shell with an inside diameter of 12 ft. If the igloo is constructed of snow block having a uniform thickness of 2 ft and weighing 40 lb/ft3, find the weight of the igloo, neglecting the entrance. Also, if fresh air contains 0.04% carbon dioxide, find the amount of this gas in the igloo when freshly ventilated.
Water flows from the ground floor to the third floor in a 4-storey building through a pipe 50 mm in diameter at a rate of 2 L/s and according to the diagram below. The water flows out from the system through a tap with an opening diameter of 15 mm. Q1. Calculate the energy loss due to friction as the water flows through the pipe (J/Kg) Q2. Calculate the total energy loss due to friction through the system (J/Kg) Q3. Calcualte the pressure at point 1 (kN/m2)
Water flows out of a hemispherical tank at the constant rate of 18 cu cm per min. If the radius of the tank is 8 cm, how fast (cm/min) is the water level falling when the water is 4cm deep?A. -0.1491 C. -0.1194B. -0.1941 D. -0.1149
A water tank of 18 it wide, 14 ft long and 4 ft high, calculate the pressure (mmHg) at the bottom of the tank.